What is CVE-2025-12657?

CVE-2025-12657 is a medium-severity vulnerability in MongoDB, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 5.0/10. Published 2025-11-03.

How severe is CVE-2025-12657?

Medium severity. CVSS v3 base score is 5.0 out of 10.

Vulnerability in MongoDB

CVE-2025-12657

The KMIP response parser built into mongo binaries is overly tolerant of certain malformed packets, and may parse them into invalid objects. Later reads of this object can result in read access violations.

Published 2025-11-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (27.9th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

MongoDB
MongoDB Inc. Server — versions 6.0, 8.0

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

References

jira.mongodb.org/browse/SERVER-101230 (Vendor Advisory)

Frequently asked questions

What is CVE-2025-12657?: CVE-2025-12657 is a medium-severity vulnerability in MongoDB, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 5.0/10. Published 2025-11-03.
How severe is CVE-2025-12657?: Medium severity. CVSS v3 base score is 5.0 out of 10.